
					jQuery(document).ready(function($){
					// browser window scroll (in pixels) after which the "back to top" link is shown
					var offset = 300,
						//browser window scroll (in pixels) after which the "back to top" link opacity is reduced
						offset_opacity = 1200,
						//duration of the top scrolling animation (in ms)
						scroll_top_duration = 700,
						//grab the "back to top" link
						$back_to_top = $('.cd-top');
				
					//hide or show the "back to top" link
					$(window).scroll(function(){
						( $(this).scrollTop() > offset ) ? $back_to_top.addClass('cd-is-visible') : $back_to_top.removeClass('cd-is-visible cd-fade-out');
						if( $(this).scrollTop() > offset_opacity ) { 
							$back_to_top.addClass('cd-fade-out');
						}
					});
				
					//smooth scroll to top
					$back_to_top.on('click', function(event){
						event.preventDefault();
						$('body,html').animate({
							scrollTop: 0 ,
						 	}, scroll_top_duration
						);
					});
				
				});
